Forum,
1. 2005 Roadster > car wouldn't unlock with remote key fob, turn signals don't flash. Key fob indicator light blinks on/off VERY faintly when LOCK or UNLOCK buttons are pressed. Alarm system doesn't disarm.
2. Unlock car manually and SKREEM alarm goes off, turn signals flash for ~ 3 minutes. Pressing PANIC button on fob will not secure alarm. Alarm system still armed. Car will momentarily (~ 10 seconds) start then dies times 2. Car will not start after second attempt.
3. Replaced key fob batteries > no change from # 1 above.
4. Remove battery negative cable for ~ 5 minutes and replaced. Fob remote unlock/ignition/alarm arming/disarming all work as advertised.
5. 4.5 days later replaced car battery with Optima yellow top. No recurring problems since (~ 1 week).
6. Moral: (1) Keep a pack of (2) 2025 lithium batteries and a 10 mm wrench in glove box !!!